Problem

MG has Multiple Regions, but the evcc MG Vehicle configuration only allows for EU.

MG accounts for one region do not work in other regions.

Solution

1. Have a "REGION" option on the MG Vehicle configuration to chose the region (e.g. EU or AU)
2. AND/OR allow URL to be specified for MG's API (e.g. https://gateway-mg-au.soimt.com/api.app/v1/ )

Background Information

MG configuration is hardcoded to EU URL:
https://gateway-mg-eu.soimt.com/api.app/v1/

However, there is also an AU region (and possibly more to come)
https://gateway-mg-au.soimt.com/api.app/v1/ <-- Works for Australia and New Zealand.

EU API does not allow MG vehicles to work in from the AU Region, as they receive the following error:

Request failed with status code 400.
cannot create vehicle type 'template': cannot create vehicle type 'mg': 1000036: The account is not registered..

However when using the said-python-mqtt-gateway with the following configuration, the account will log in.

services:
  saic-mqtt-gateway:
    image: "saicismartapi/saic-python-mqtt-gateway:latest"
    container_name: "saic-mqtt-gateway"
    environment:   
      - SAIC_REST_URI=https://gateway-mg-au.soimt.com/api.app/v1/
      - SAIC_REGION=au

Happy to assist if you need anyone to test or debug.

BTW I am a developer (Windows), but could not find a guide on compiling evcc that worked (and I attempted several different ways) - so I couldn't make the change myself. Let me know if there is a guide (on Windows?) that I have missed and I might be able to make the change myself.

Thankyou!